Nick Cannon was diagnosed with lupus back in 2012. He has since been very vocal about what it’s like to live with the autoimmune disease and to be in and out of the hospital for treatment. This week, it appears the condition has gotten the best of him. Thus, Mariah Carey’s ex is going to spend Christmas in the hospital instead of reuniting with his kids and the diva.

On Thursday, the “When I Was Your Man” hitmaker took to Instagram to update his fans on his whereabouts. Apparently, Cannon is undergoing treatment for lupus, so he will be stuck in Los Angeles’ Cedars-Sinai Hospital for a couple of days. The snap he shared on the photo-sharing platform shows his arm and his chest with some wires connected to a monitoring apparatus. Despite the setback, Cannon seemed to be optimistic about the situation since he wrote that his doctors told him he’ll be back to normal in time for the New Year celebrations.

While Cannon’s getting treatment for lupus, he’ll be missing out on spending time with his kids, Monroe and Moroccan Scott, who are currently with his ex-wife. In one of Carey's latest Instagram posts, the songstress shared a video of her with Moroccan while she’s preparing her “favorite sauce” for their meal. In the clip, the mother and son are grooving to Carey’s smash hit “All I Want For Christmas Is You” in the kitchen.

If Cannon hadn’t been down because of his condition, he could have been part of the family bond, since the exes have promised to be there for their kids all the time despite their split. Just last week, Cannon and Carey reunited along with their kids for some quality time together.

“I think that’ll be something that we’ll always embrace as a family and as our families expand,” Cannon told People last month. “There’s no hard feelings and ill will. Ultimately, it’s about putting the kids first and making sure they have the best childhood they could possibly have.”

Meanwhile, talking to HuffPost Live about his disease early this year, Cannon revealed that he was absolutely terrified because he had never heard of lupus before. "I knew nothing about it until I was diagnosed.... But to me, I'm healthier now than I've ever been before,” he said at the time. He also revealed then that he’s taking “preventative measures” to ward off flare-ups.